NVIDIA Mellanox MCX311A-XCAT ConnectX-3 EN 10GbE Single-Port SFP+ PCIe 3.0 x4 Adapter, Lot of 10: This is a single-port 10 Gigabit Ethernet network interface card based on the Mellanox ConnectX-3 EN ASIC, in standard PCIe form factor with an SFP+ cage. MPN MCX311A-XCAT. This is NOT a dual-port card, NOT InfiniBand-capable, NOT an OCP mezzanine, and NOT a 25/40/100GbE adapter. Sold as a Lot of 10, refurbished and tested.
Engineering Context: ConnectX-3 EN delivers 10GbE wire-speed throughput on a single SFP+ port with a PCIe Gen3 x4 host interface. Hardware offloads include stateless TCP/UDP/IP checksum, Large Send Offload (LSO), Large Receive Offload (LRO), and VLAN tagging. RDMA over Converged Ethernet (RoCE) is supported for low-latency RDMA storage and HPC workloads. SR-IOV is supported for virtualized server environments.
Deployment & Use Cases: 10GbE server uplinks for virtualization hosts (VMware ESXi, Hyper-V, KVM, Proxmox), Storage Spaces Direct and Ceph nodes using RoCE, NFS / SMB file servers, edge compute hosts, and lab / homelab 10GbE upgrades from onboard 1GbE NICs.
Technical Specifications:
- MPN: MCX311A-XCAT
- Controller: Mellanox ConnectX-3 EN
- Ports: 1x SFP+
- Speed: 10 Gigabit Ethernet
- Host Interface: PCI Express 3.0 x4
- Form Factor: Standard PCIe (low-profile, full-height bracket)
- Protocol Support: 10GbE, RoCE (RDMA over Converged Ethernet)
- Stateless Offloads: TCP/UDP/IP checksum, LSO, LRO, VLAN tagging
- Virtualization: SR-IOV
- Pack Quantity: Lot of 10
- Condition: Refurbished, tested
- Brand: NVIDIA Mellanox
Compatibility & Constraints: Supported on Linux (in-kernel mlx4_en driver), VMware ESXi, Microsoft Windows Server, and FreeBSD with vendor drivers. Accepts standard SFP+ DAC cables and SR / LR optical transceivers at 10GbE rates. NOT compatible with 25GbE / 40GbE / 100GbE links — this is a 10GbE-only adapter. NOT an InfiniBand VPI card; it is Ethernet-only (EN). Does NOT fit OCP Mezzanine slots.
Why TES: T.E.S IT-SOLUTIONS specializes in refurbished NVIDIA Mellanox enterprise networking hardware. Each MCX311A-XCAT card is bench-tested before shipment. Handling time 1–3 business days. Request a quote.